forked from boostorg/algorithm
62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
/*
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Copyright (c) Marshall Clow 2017.
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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/// \file transform_reduce.hpp
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/// \brief Combine the (transformed) elements of a sequence (or two) into a single value.
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/// \author Marshall Clow
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#ifndef BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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#define BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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#include <functional> // for std::plus
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#include <iterator> // for std::iterator_traits
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#include <boost/config.hpp>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/value_type.hpp>
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namespace boost { namespace algorithm {
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template<class InputIterator, class OutputIterator, class T, class BinaryOperation>
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OutputIterator inclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result, BinaryOperation bOp, T init)
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{
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for (; first != last; ++first, (void) ++result) {
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init = bOp(init, *first);
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*result = init;
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}
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return result;
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}
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template<class InputIterator, class OutputIterator, class BinaryOperation>
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OutputIterator inclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result, BinaryOperation bOp)
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{
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if (first != last) {
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typename std::iterator_traits<InputIterator>::value_type init = *first;
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*result++ = init;
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if (++first != last)
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return boost::algorithm::inclusive_scan(first, last, result, bOp, init);
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}
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return result;
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}
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template<class InputIterator, class OutputIterator>
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OutputIterator inclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result)
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{
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typedef typename std::iterator_traits<InputIterator>::value_type VT;
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return boost::algorithm::inclusive_scan(first, last, result, std::plus<VT>());
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}
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}} // namespace boost and algorithm
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#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP
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